Aground-breaking Bell & Ross watch is set to become the most expensive item on Mr Porter. The BR-X1 Skeleton Tourbillon Sapphire will retail at $480,000. Mr Porter is the only retailer of the Blue version of the BR-X1 Skeleton Tourbillon Sapphire – the only one in the world – where parts of the watch, including the dial, the main plate, hour and minute hands, screws, the bridges and flying tourbillon cage have a unique deep-blue finish.

The full case is cut out of five blocks of sapphire and it takes several days to produce the components for this single watch. Housed within the full sapphire case is a hand-wound skeleton flying-tourbillon movement, manufactured in-house by Bell & Ross, which, when brought together on the translucent rubber strap, showcases a unique “floating” look upon the wrist.

“We are thrilled to partner with Bell & Ross to launch an exclusive BR-X1 Skeleton Tourbillon Sapphire. This timepiece is a true rarity and an achievement in design and manufacturing,” says Toby Bateman, Managing Director of Mr Porter.

“Bell & Ross marks a turning point by breaking, once again, the traditional watchmaking codes and shows that high-end luxury and digital can combine perfectly,” adds Carlos A Rosillo, CEO, Bell & Ross.